virtio: fix memory leak in virtqueue_add()

When using the indirect buffers feature, 'desc' is allocated in
virtqueue_add() but isn't freed before leaving on a ring full error,
causing a memory leak.

For example, it seems rather clear that this can trigger
with virtio net if mergeable buffers are not used.

Cc: stable@vger.kernel.org
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 114a0c88afb8..5ed228ddadba 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -327,6 +327,8 @@ static inline int virtqueue_add(struct virtqueue *_vq,
                  * host should service the ring ASAP. */
                 if (out_sgs)
                         vq->notify(&vq->vq);
+                if (indirect)
+                        kfree(desc);
                 END_USE(vq);
                 return -ENOSPC;
         }